CN109888608A - A kind of optical wrench - Google Patents
A kind of optical wrench Download PDFInfo
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- CN109888608A CN109888608A CN201910334008.4A CN201910334008A CN109888608A CN 109888608 A CN109888608 A CN 109888608A CN 201910334008 A CN201910334008 A CN 201910334008A CN 109888608 A CN109888608 A CN 109888608A
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Abstract
The present invention provides a kind of optical wrench, including laser, less fundamental mode optical fibre, optical fiber probe and the mode stripper set gradually along less fundamental mode optical fibre, Polarization Controller, all -fiber Acousto-optic mode converter.Optical wrench of the invention is all optical fibre structure, and insertion loss is small, and light wave mode is dynamically adapted.
Description
Technical field
The present invention relates to optical devices technologies fields, and in particular to a kind of optical wrench.
Background technique
Optical tweezer can using distribution of light intensity spatial variations formed gradient force particle is steadily captured light field most strength i.e.
The focal position of light beam can drive particle to move together when laser beam is mobile, realize and manipulate to the three-dimensional precise of particle.Light
From AT&T Labs scientist A.Ashkin since invention in 1986, research and application are rapidly developed tweezer technology,
Especially in life science, optical tweezer has become indispensable tool, can be used to manipulate particle, study the quiet of biomone
State and dynamic mechanical behavior even carry out accurate operation to large biological molecule.
Optical wrench is to irradiate particle on the basis of optical tweezer technology using the light beam with angular momentum (AM), imprisoning
While particle, part angular momentum is passed into particle, so as to cause its rotation, that is, in optical tweezer to the Three dimensional steerable of particle
On the basis of increase one-dimensional angular manipulation again.Nineteen ninety-five He et al. observes photon trajectory angular momentum to grain in an experiment at first
The transmitting of son, and realize the manipulation using optics spiral to fine particle.There are two types of the angular momentums of light, one is with light beam
The relevant spin angular momentaum of polarization characteristic (SAM) needs particle to have stronger birefringent characteristic when using this light beam；It is another
Kind angular momentum is orbital angular momentum (OAM) relevant to the helical phase structure of light beam, and this light beam is also commonly known as spiral
Light, light vortex etc..Since the quantum number of spin angular momentaum only has ± 1, and the quantum number of orbital angular momentum can be very big, in phase
With under the requirement of revolving speed, optical power needed for the high light beam of orbital quantum number can be much smaller；Simultaneously as vortex beams center
There are phase singularity, central light strengths zero, so being had compared with the optical tweezer for using common laser beam using the optical tweezer of vortex beams
There is stronger axial direction to catch sunken power, lifting same sample only needs seldom laser power, this, which is just considerably reduced, becomes trapped carefully
Born of the same parents are by the danger destroyed.
Optical fiber optical tweezers are to generate optical trap using the laser beam of fiber exit to realize the manipulation to fine particle.Due to
Optical fiber optical tweezers have independent optical path, separate ligh trap and its manipulation with optical microscopy, efficiently solve traditional optical tweezer instrument
The drawbacks of device.The optical fiber that Constable in 1993 et al. is propagated using two Accurate collimations, in opposite directions forms stable ligh trap success
Realize the capture of polystyrene sphere and active dry yeasr.2004, three optical fiber light of Japanese Masahiro Ikeda et al.
Trap realizes the suspension of symmetrical plasticity speck body in liquid, and realizes slewing maneuver.Domestic Harbin Engineering University's model is vertical
Wave group has carried out various researchs to single, double optical fiber optical tweezers, devises twin-core fiber optical tweezer, realizes the three-dimensional to particle
Capture.
Since optical wrench needs vortex beams, and the generation of vortex beams is still a present difficult point.Tradition generates
The method of vortex beams have geometric optics mode conversion method, spiral phase plate method, calculate holography method, liquid crystal spatial light modulation method,
Laser directly output method etc., that there are conversion system structures is complicated for these methods, optical transform loss is big, spiral topological charge is single or
Impure, more difficult acquisition stabilized light source etc. one or many-sided disadvantage.So an important research direction of optical wrench is small
It is type, integrated with optical fiber.Bristol university, Britain Siyuan professor Yu is based on waveguide Whispering-gallery-mode resonance using a kind of
The OAM ballistic device of chamber, the large-scale integrated for opening orbital angular momentum photonic device obtain approach；University of Southern California is by circular polarization
Gaussian beam be incident on square fibre core, annulus index distribution special optical fiber in, can be in optical fiber of the length less than 1cm
Inspire the OAM mould that quantum number reaches 9.Zhejiang University is old, which to apply, clean is realized by controlling incident angle based on LP21The monochromatic light of mould
Fiber optical optical tweezers system.
However it is generally existing following insufficient in current technology:
1. the method for spatial light pattern conversion when being used for optical fiber optical tweezers, needs to carry out in the incidence end of optical fiber accurate mostly
Coupling, it is ensured that the mode specified in excitation fiber, coupling efficiency is lower, and insertion loss is larger.
2. the method for spatial light pattern conversion is when being used for optical fiber optical tweezers, when needing to excite different OAM modes, optical fiber
The coupling of incidence end needs to correspond to different modes and is adjusted correspondingly, and control structure is complicated, and adjustment time is long, is not suitable for
It is adjusted in dynamic.
3. existing all -fiber mode conversion method needs the photonic crystal to inclination long-period gratings or special construction
Optical fiber is reversed, and is not also suitable for dynamic and is adjusted.
Summary of the invention
The present invention is that the current optical wrench insertion loss of solution is big, is not suitable for the technical problems such as mode dynamic adjustment,
Provide a kind of optical wrench.
The technical solution adopted by the invention is as follows:
A kind of optical wrench is set gradually including laser, less fundamental mode optical fibre, optical fiber probe and along the less fundamental mode optical fibre
Mode stripper, Polarization Controller, all -fiber Acousto-optic mode converter.
The laser is optical fiber laser, and the tail optical fiber of the optical fiber laser passes through fusion point and the less fundamental mode optical fibre phase
Even.
The mode stripper is fiber mode stripper.
The Polarization Controller is optical fiber polarization controller.
First piezoelectricity of the tangential vibrations that all -fiber Acousto-optic mode converter is mutually perpendicular to place by direction of vibration is made pottery
Tile and the second piezoelectric ceramic piece and aluminium cone are mutually bonded composition.
Wherein, the less fundamental mode optical fibre for removing coat is made pottery from pre-perforated first piezoelectric ceramic piece, second piezoelectricity
It is passed through in tile and aluminium cone, and is bonded in aluminium vertex of a cone end.
The optical fiber probe is made by the less fundamental mode optical fibre.
Beneficial effects of the present invention:
By introducing all -fiber Acousto-optic mode converter, the dynamic that can be realized light wave mode in optical fiber adjusts the present invention,
By controlling quantity, frequency, the amplitude and phase relationship of sound wave, the orbital angular momentum of concentrated vorticity optically-active can be dynamically controlled, is made
Optical fiber optical tweezers become optical wrench, have the advantages such as insertion loss is small, is dynamically adapted.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the optical wrench of one embodiment of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the optical wrench of the embodiment of the present invention, including laser 1, less fundamental mode optical fibre 2, optical fiber probe 3 and
Mode stripper 4, Polarization Controller 5, all -fiber Acousto-optic mode converter 6 set gradually along less fundamental mode optical fibre 2.
Wherein, the light of the sending of laser 1 inputs less fundamental mode optical fibre 2, excites basic mode light and other a small amount of height in less fundamental mode optical fibre 2
Rank mode light wave.After mode stripper 4, high-order light wave mode is depleted, and only remaining basic mode light is in less fundamental mode optical fibre 2
Transmission.Basic mode light adjusts polarization state by Polarization Controller 5, into all -fiber Acousto-optic mode converter 6.All -fiber acousto-optic mode
Basic mode light is converted to the high-order light wave mode with orbital angular momentum by converter 6, is exported from 3 end face of optical fiber probe.Wherein, light
The gradient force of field intensity fetters particle, and the polarization state of light field causes the spin of bound particle, and the orbital angular momentum of light field causes
The revolution of bound particle.
In one embodiment of the invention, laser 1 is optical fiber laser, and mode stripper 4 is fiber mode removing
Device, Polarization Controller 5 are optical fiber polarization controller, that is to say, that the optical wrench of one embodiment of the invention is all -fiber light
Learn spanner, it is simple with structure, it is cheap, can the wide advantage of opereating specification, be largely overcoming traditional optical tweezer
The disadvantages of freedom degree that is expensive, bulky and manipulating sample movement is small, operating distance is short.
In one embodiment of the invention, as shown in Figure 1, the tail optical fiber 7 of optical fiber laser can pass through fusion point 8 and few mould
Optical fiber 2 is connected.Wherein, tail optical fiber 7 can be single mode optical fiber.
As shown in Figure 1, all -fiber Acousto-optic mode converter 6 can be mutually perpendicular to the of the tangential vibrations placed by direction of vibration
One piezoelectric ceramic piece 61 and the second piezoelectric ceramic piece 62 and aluminium cone 63 are mutually bonded composition.Wherein, few mould of coat is removed
Optical fiber can be bored in 63 from the first pre-perforated piezoelectric ceramic piece 61, the second piezoelectric ceramic piece 62 and aluminium and be passed through, and be bonded in aluminium cone
63 tops.
In one embodiment of the invention, optical fiber probe 3 is made by less fundamental mode optical fibre 2, for example, can be by few mould
2 one end of optical fiber the processing such as is etched and obtains optical fiber probe 3.
Based on the structure of above-mentioned optical wrench, the light that laser 1 issues can input few mould light by fusion point 8 through tail optical fiber 7
Fibre 2, the light wave mode that wherein tail optical fiber 7 is propagated are basic mode LP01Mould filters out high-order light wave mode, remaining base by mode stripper 4
Mould light wave mode is after Polarization Controller 5 controls polarization direction, into all -fiber Acousto-optic mode converter 6.All -fiber acousto-optic mould
Piezoelectric ceramic piece loading frequency f, amplitude v and the phase of formula converter 6Tangential vibrations are generated after adjustable ac signal,
Oscillation Amplitude generates the bending ultrasonic wave (lowest-order scratches traveling wave) along spread fiber, ultrasound by 63 amplification of aluminium cone on optical fiber
The frequency and amplitude of wave can be controlled by the frequency and amplitude of ac signal.When the signal frequency and amplitude of load meet light wave
Basic mode LP01To secondary high-order mode LP1nWave vector matching condition when, light wave LP in a fiber01Mould can be completely converted into LP1n
Mould.
Specifically, loading the identical alternating current of two frequencies simultaneously in two vertical piezoelectric ceramics on pieces of direction of vibration
Signal, by the amplitude and phase relationship for controlling two AC signals, so that it may it is orthogonal curved to control two direction of vibration
The Oscillation Amplitude and phase relation of bent ultrasonic wave, and then can control the LP of coupling1nThe amplitude and phase relationship of light wave degenerate mode,
Realize the control to the photon trajectory angular momentum+1,0, -1 of synthesis.Vortex light containing orbital angular momentum is from 3 end face of optical fiber probe
Output, the operation objects such as control particle realize the operation such as rotation, revolution.
Further, by loading two suitable frequency of sound wave f in each piezoelectric ceramics on piece1、f2Meet light wave respectively
LP01-LP1nAnd LP1n-LP2m(n and m are natural number, can take wave vector matching condition 1), so that it may realize LP01-LP1n-LP2m
Continuous conversion.Pass through adjust two direction of vibration piezoelectric ceramic piece ultrasound-driven phase, so that it may assign photon+2,
0, -2 orbital angular momentum.
Further, the mode conversion of higher order can pass through the ultrasonic telecommunications in piezoelectric ceramics on piece superposition more multi-frequency
Number, to meet the light wave mode conversion of higher order.By controlling quantity, frequency, the amplitude and phase of driving signal, realize at different levels
Light wave Mode Coupling forms the optical rail angular momentum of higher order, increases the control range of optical wrench orbital angular momentum.
Optical wrench according to an embodiment of the present invention can be realized optical fiber by introducing all -fiber Acousto-optic mode converter
The dynamic of middle light wave mode adjusts, and by controlling quantity, frequency, the amplitude and phase relationship of sound wave, can dynamically control synthesis
The orbital angular momentum of vortex light makes optical fiber optical tweezers become optical wrench, has the advantages such as insertion loss is small, is dynamically adapted.
In the description of this specification, the description of reference term " one embodiment " means to combine the tool of embodiment description
Body characteristics, structure, material or feature are included at least one embodiment of the present invention.In the present specification, to above-mentioned art
The schematic representation of language is necessarily directed to identical embodiment or example.Moreover, the specific features of description, structure, material
Or feature may be combined in any suitable manner in any one or more of the embodiments or examples.In addition, not conflicting
In the case of, those skilled in the art can by different embodiments or examples described in this specification and different embodiment or
Exemplary feature is combined.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of optical wrench, which is characterized in that including laser, less fundamental mode optical fibre, optical fiber probe and along the less fundamental mode optical fibre
Mode stripper, Polarization Controller, all -fiber Acousto-optic mode converter set gradually.
2. optical wrench according to claim 1, which is characterized in that the laser is optical fiber laser, the optical fiber
The tail optical fiber of laser is connected by fusion point with the less fundamental mode optical fibre.
3. optical wrench according to claim 2, which is characterized in that the mode stripper is fiber mode stripper.
4. optical wrench according to claim 3, which is characterized in that the Polarization Controller is optical fiber polarization controller.
5. optical wrench according to claim 4, which is characterized in that all -fiber Acousto-optic mode converter is by vibration side
Composition is mutually bonded to the first piezoelectric ceramic piece of the tangential vibrations for being mutually perpendicular to place and the second piezoelectric ceramic piece and aluminium cone.
6. optical wrench according to claim 5, which is characterized in that wherein, remove the less fundamental mode optical fibre of coat from beating in advance
First piezoelectric ceramic piece, second piezoelectric ceramic piece and the aluminium in hole pass through in boring, and are bonded in the aluminium vertex of a cone
End.
7. optical wrench according to claim 6, which is characterized in that the optical fiber probe made by the less fundamental mode optical fibre and
At.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910334008.4A CN109888608A (en) | 2019-04-24 | 2019-04-24 | A kind of optical wrench |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910334008.4A CN109888608A (en) | 2019-04-24 | 2019-04-24 | A kind of optical wrench |
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| Publication Number | Publication Date |
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| CN109888608A true CN109888608A (en) | 2019-06-14 |
Family
ID=66938266
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| CN201910334008.4A Withdrawn CN109888608A (en) | 2019-04-24 | 2019-04-24 | A kind of optical wrench |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722448A (en) * | 2020-07-23 | 2020-09-29 | 南开大学 | Magnetron tunable terahertz orbital angular momentum beam generator based on microstructured fiber whispering gallery mode microcavity |
| CN111899907A (en) * | 2020-08-10 | 2020-11-06 | 上海大学 | Conveying device |
-
2019
- 2019-04-24 CN CN201910334008.4A patent/CN109888608A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722448A (en) * | 2020-07-23 | 2020-09-29 | 南开大学 | Magnetron tunable terahertz orbital angular momentum beam generator based on microstructured fiber whispering gallery mode microcavity |
| CN111899907A (en) * | 2020-08-10 | 2020-11-06 | 上海大学 | Conveying device |
| CN111899907B (en) * | 2020-08-10 | 2022-12-27 | 上海大学 | Conveying device |
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Application publication date: 20190614 |
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